Error Verifying smart contract on EtherScan using Hardhat

Question

Below is my smart contract (already deployed). When i try and verify it to submit the code to Etherscan I am getting the error below and I really don't know why. Please can someone advise?

 npx hardhat verify --network ropsten 0xE9abA803d6a801fce021d0074ae71256C9F24Da4

Error Message:

 Error in plugin @nomiclabs/hardhat-etherscan: More than one contract was found to match the deployed bytecode.
 Please use the contract parameter with one of the following contracts:
 * @openzeppelin/contracts/finance/PaymentSplitter.sol:PaymentSplitter
  * contracts/MyNFTContract.sol: MyNFTContract

 For example:

   hardhat verify --contract contracts/Example.sol:ExampleContract <other args>

 If you are running the verify subtask from within Hardhat instead:

   await run("verify:verify", {
     <other args>,
     contract: "contracts/Example.sol:ExampleContract"
  };

MyNFTContract.sol:

 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.0;

 import "@openzeppelin/contracts/finance/PaymentSplitter.sol";

 contract MyNFTContract is PaymentSplitter {
     // Addresses of payees
     address[] private _CSPayees = [
         0x23377d974d85C49E9CB6cfdF4e0EED1C0Fc85E6A,
         0x85F68F10d3c13867FD36f2a353eeD56533f1C751
     ];
     // Number of shares allocated per address in this contract.  In same order as _CSPayees
     uint256[] private _CSShares = [1, 2];

     constructor() PaymentSplitter(_CSPayees, _CSShares) {}
 }

My deploying script deploy.js:

 async function main() {
const PaymentSplitter = await ethers.getContractFactory("MyNFTContract")

// Start deployment, returning a promise that resolves to a contract object
const myNFT = await PaymentSplitter.deploy()
console.log("Contract deployed to address:", myNFT.address)
 }

 main()
.then(() => process.exit(0))
.catch((error) => {
    console.error(error)
    process.exit(1)
})

score 13 · Answer 1 · answered Sep 21 '21 at 18:55

Hardhat found multiple contracts in the project (your MyNFTContract and the imported PaymentSplitter), and it doesn't know against which one you want to verify the bytecode.

You need to specify the contract (that you want to verify) with the --contract option.

npx hardhat verify \
--contract "contracts/MyNFTContract.sol" \
--network ropsten 0xE9abA803d6a801fce021d0074ae71256C9F24Da4

score 0 · Accepted Answer · edited Jan 05 '23 at 12:24

0

I imported these

require("@nomiclabs/hardhat-waffle");
require("@nomiclabs/hardhat-etherscan");

and it worked

edited Jan 05 '23 at 12:24

Suraj Rao

29,388
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answered Jan 05 '23 at 12:21

Hero

16
1

2

Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Jan 05 '23 at 13:49

Error Verifying smart contract on EtherScan using Hardhat

2 Answers2